Changes in the interposed capsule after Chiari osteotomy. An experimental study on rabbits with acetabular dysplasia

Abstract

We have investigated the changes in the interposed capsule after a Chiari pelvic osteotomy, in an experimental study on dysplastic hips in 20 adolescent rabbits. Radiographic, macroscopic and microscopic observations were made up to 12 months after operation. The new acetabular roof had incorporated the interposed capsule and remodelled completely by six months. By 12 months there was a new, stable hip with continuity between the capsule and the original acetabular cartilage. Histologically, the capsule underwent metaplastic change to fibrocartilaginous tissue after six months, with some hyaline-like cartilage near the joint surface. These changes in the interposed capsule play an important role in the formation of a new joint after a Chiari pelvic osteotomy.

Tissue on the Transferred Coracoid Graft After Latarjet Procedure: Histological and Morphological Findings

“…The investigators showed that in rabbits undergoing osteotomies, primary cloning of chondrocytes and metaplasia of the cartilage in the fibrous tissue were seen. In an experimental study on rabbits, Hiranuma et al 15 showed similar results with metaplastic changes to fibrocartilaginous tissue after Chiari pelvic osteotomy.…”

High Survival of Dome Pelvic Osteotomy in Patients with Early Osteoarthritis from Hip Dysplasia

“…Postoperative radiographic measurements indicated that technical factors and inadequate coverage of the femoral head led to the advanced radiographic stage. Although the interposed capsule after the DPO or original Chiari osteotomy changes to fibrous cartilage [9], insufficient coverage may inhibit proper cartilage transformation of the interposed capsule. The postoperative AHI, as for original Chiari osteotomy [12], might be a better index than the center-edge angle because the patients in our study had deformed femoral heads (30 of 59 hips [51%]).…”

Clinical Outcomes Evaluation of Combined Valgus and Chiari Osteotomy Inconsistent with Patient Satisfaction

“…Osteotomy has therefore been proactively used to treat comparatively young patients, even if arthritic changes are advanced. Chiari osteotomy is a surgical procedure that reduces pain by improving coverage of the acetabulum and promoting reproduction of the fibrocartilage derived from the joint capsule [ 2 – 4 ]. Valgus osteotomy of the hip [ 5 – 10 ] is a widely performed procedure to achieve joint stability, repair, and regeneration using the proliferative changes of osteoarthritis.…”